#include <stdio.h>
#include <math.h>
int main()
{
    double a, b, c, disc, x1, x2, p, q;
    scanf("%lf%lf%lf", &a, &b, &c);
    disc = b * b - 4 * a * c;
    if (disc < 0)
    {
        printf("This equation hasn'treal roots\n");
    }
    else
    {
        p = -b / (2.0 * a);
        q = sqrt(disc) / (2.0 * a);
        x1 = p + q;
        x2 = p - q;
        printf("real roots:\nx1=%7.2f\nx2=%7.2f\n", x1, x2);
    }
    return 0;
}